Pressure gauge



Original Filed April 29, 1910 i hdii WILLIAM P. HAMMOND, OF PASSAI, AND THEODORE A. HAMMOND, OF RUTEERFRD,

` NEW JERSEY.

A PRESSURE GAUGE.

original appucanonaiea April 29, 1910, serial No. 558,413. Divided and this application led October 30.

1915. Serial No. 58,887.

T all whom 'it muy concern.'

Be it known that we. `WILLIAM P. HAM-x Moxn and THnooorn A, HAMMOND, citizens of the United States oi America, residing in Passaic, in the county of Passaic and State p New Jersey, and Rutherford, Bergen County, New Jersey, respectively, have invented certain new and useful Improv J- ments in Pressure Gauges, of which the fol-V lowing is a specification.

This is a divisional application, the subject-matter thereof havin been divided out of our prior application LSerial No.` 558,413, filed April 29, 1910.

Theinvention relates to certain new and useful improvements in theconstruetion of pressure gauges such as are commonly employed for measuring the pressure within a pneumatic tire or other luid pressure coutainer, the objectof the invention being` to provide a device of this character which embodies novel features of construction whereby it can be used either in connection with tire ination means or independently thereof as a pressure gauge.

Further objects of the invention are to provide a device of this character which can be' set to blow-oli? and relieve the pressure at any desired point so as to prevent overinflation, which can be readily applied to an ordinary tire valve casing, and which is comparatively simple and inexpensive in its construction.

With these and other invention consists incertain novel combinations and arrangements of the parts as will more fully appear as the description proceeds, the novel features thereof being pointed outl in the appended claims.

For a full understanding of the invention, referenceis to be had to the following description and accompanying drawings, 1n

which Figure 1 is a longitudinal sectional view through a lblow-of`f pressure gauge and pump connection constructed in accordance with the invention, and

Figure 2 is a side elevation of the same, a portion of theblow-oif jacket being broken 59 awayto show the graduated scale of the gauge.

Figure 3 is a detail view` tion, of the pump connection Corresponding and like parts are referred partly in secobjects in view, the

to in the following description and indicated in .all the views oi' the drawings by the same reference characters.

Specifically describing the construction ol the blow-oill gauge as illustrated by the drawings, the numeral 1 designates a tube which is provided at the outer end therof with a pressure head 2, and at the inner end thereof with an exteriorly threaded nipple 3 of such a size as to be readily screwed into the mouth of a standard tire valve casing. Surrounding the tube 1 is a barrel 4 which is adapted to slide in and out, the interior of the barrel being engaged by the pressure barrel being closed by a head 5 which cooperates witht-he pressure head 2 and barrel to provide a pressure chamber 6. rlhe inner end of the barrel 4 has a ring 7 applied thereto and a coil spring 8 which surrounds the exterior of the tube 1 is inter osed be tween the ring 7 and the pressure ead 2 so head 2 and the outer end of the l as to normally hold the barrel 4 at the inner limit 'of its movement with the head 5 in close proximity' to the presssure head 2.

`The head 5 at the outer end 'of the barrel 4 is provided with an outwardly projecting pump engaging nipple 9 and alsowith an inwardly projecting inflation tube 10 which slides within the tube 1 and has an inwardly opening check l[valve 11 fitted therein. This check, valve 11 vis adapted to open inwardly to permitan iniiux of air from 'a pump or the like, althoughit automatically closes to prevent any reflux of the air. The exterior diameter of the inflation tube 10 is materially less than the interior diameter of the tube 1 so that an air passage is provided lbetween the two members through which air can iow freely into the pressure chamber 6;

An exterior shell 12 surrounds the barrel 4 and is carried by the tube 1, one end ott` the shell 12 being formed with an end piece 13 which engages the said tube. A longitudinal slot 14 is formed in this shell 12 and a series of graduations 15 are located upon the shell adjacent the vedges of the slot so as to cooperate with an annular graduation 16 on the barrel 4. t will be obvious that pressure within the pressure chamber 6 will act uponfthe pressure head 2 to slide the barrel 4 outwardly upon the tube 1 against the action of the spring 8, and the graduations 15 are so arranged is to c ..ipei'ate with the graduation 1G oi the barrel to indicate the degree of pressure within the pressure chamher in pounds per square inch or other suitable measure ot' pressure.

lVhen the device is used independently as a gauge, the nipple il of the pressure tuhe 1 is applied to the valve casingrof pneumatic tire or like container. Extending transversely across the mouth of the nipple 3 is a rigid pin 17 which will engage and alitoinatically unseat. the Vtire valve in the act of applying the nipple to the tire valve casing. The pressure within the tire will be transmitted through the tube l llo the pressure chamber 6 so as to slide the barrel 4 outwardly until the degree of pressure within thi` tire is indicated upon the scale l5, the pressure Within the chamber 6 beiner then exactly counter-balanced by the spring Should it be desired to increase the pressure within the tire. a pump could be connected to the pump engaging nipple 9. the check valve 11 openingr inwardly to permit the influx of air and closing outwardly to prevent any reflux of air. The long inflation tube 10 projecting through the tube 1 would then serve to prevent the pulsations of pressure from the puinp being transmitted to 'the pressure chamber 6, the. pressure within the latter chamber being the still pressure of the tire.

The pressure gauge as thus described comprises essentially a pair of -telescoping elements which are constructed for cooperation with each other to form a pressure chamber, one of the telescoping elements being provided with a seat or nipple adapted to engage the air valve casing of a pneumatic tire to place the pressurek chamber in communication with the interior of the tire. One of these telescoping elements consists of the tubular member 1 and pressure head 2, while the opposite 'telescoping element consists of the barrel 4 and head 5. The fixed member 17 upon the. nipple or seat 3 would automatically open the valve when the gauge was applied to the valve casing of a tire, and the pressure within the chamber formed by the telescoping elements would tend to move one of the said elements in such a manner as to indicate the amount of the pressure.

A blow-otfjacket 18 may bc fitted adj ustably upon the outer shell 12 so as to automatically open 'the valve 11 and relieve the pressure within the tire when the pressure reaches a predetermined point. The end 19 of the jacket 18 is formed with a blow-off opening 20 which communicates with the outer atmosphere and is provided with a pin 22 adapted to engage the stem of the valve 11 to open the same when 'the desired pressure has been built up withinthe tire. This pin 22 is preferably threaded so as to be susceptible of adjustment, a lock nut 23 being provided for holding the pin in an adj usted position. .The blow-ofi' jacket 18 is provided with a longitudinal slot 24 which loosely receives a threaded stud 25 projecting from the4 shell -`l2. A clamping nut 26 upon the threaded stud 25 serves to clamp the blowofi' jacket in position, although it can be ybefore the blow-off valve 11 will'be opened For ini' by engagement with the pin 22.(,- stance, should it be desired to retain an eighty pound pressure within the tire, the jacket 18 would be set in position with the edge 26 thereof over the 80 graduation of the scale` 15. The parts are then so arranged that as soon as the pressure within the tire is built up 'to eight pounds per square inch and the graduation 16 of the barrel 4 brought op posite the graduation of the scale 15 the stem of the blow-off valve 11 contacts with the blow-of-pin 22. Any additional pressure will. now result in opening the blow-off valve 11 so as to relieve the same, although this valve will again close as soon as the pressure has been reduced to eighty pounds.

It is also contemplated to use the blow-0E gauge in combination with a pump connection A. This ump connection includes a tubular body 2 and an angular branch 28 which intersects the body portion 27 and is adapted to have the blowoff gauge conpected thereto. One end of the tubular body' portion 27 is threaded at 29 for connection with a pump or the like and provided with an, inwardly opening check valve 30, while the opposite end thereof is provided with a nipple 31I and connecting nut 32 for engagement withy the tire valve casing. A cross bar 33 'extends across the nipple 31 tov engage the 'tire valve and automatically open the same when the connection is applied to the tire valve casing. i The gauge can 'be set to blowoff and relieve the pressure whenfa lpredetermined pressure is built up fwithin the tire, and the pump then operated to inflate the tire in the usual manner. is thus prevented, and the operator is'warned by the sound of escaping air that the desired pressure has been reached.

n connection with the construction of' the gauge, it may be mentioned that a knurled washer member 34 is fitted upon the end of the tubular member 1 to provide a ting-er piece which can' be conveniently gripped when screwing the nipple Sinto or out of position. Set screws 35 are provided for locking this washer member 34 rigidly with the tubular member 1.

Having thus described the invention, what we claim as new and desire to secure by Letters Patent, is

1. A pressure gauge including a pair of An over-imitation place the pressure weier telescoping elements consirueted for cooperation with each other 1.oform a pressure chamber adapted to be plaeed in communication with the interio'roi lche tire, means resist-ing the telescoping' actionr of the elements caused h5? pressure Within the cham,- her formed thereby, a nipple upon one of the telescopinggr elements `for enga-gement with the vulve'. easing of the tire, en inwardly openingl check valve mounted upon the op? posite telescrnjiinP element and adapted to chamber in communication with the outer ni'ifnespheit'e a jacket carrried hy the first mentioned elescopin'g eler ment and adjustable with respectl thereto,-

and an ahut-mentfupon the jacket for engaging and openingtheL-rheek -valvevbo release the pressure when' a, predetermined pressure is reached.

2. A device of the eharneter described, comprising a pump-engaging means, a tirevnlve-eesing engaging means, a. message hetween said means, and a blow-o vmenne erryielding posed to pressure in sil-irl passage, seid hlownfl means comprising a fixed piston.y a long ruhe en which said pist-on is fixed forming s second passage couimunicat-i'ngr iviih' said iirst named passage. a cylinder slirable relatively to said piston`r u tube attached to seid cylinder extencl'ng inio saidvrsfmentienerl tube and forininff n restricted through said firSt-mentione ruhe, whereby said hlouof menus is substantially iespnnsive to the still pressure in he tire and is relatively unaf'eereil hy the impulses (lue to the neiion oi? the pump, said ruhe whieh is attached to the cylinder havin;T a vent valve therein.

ln Witness whereof, we have hereunto signed our naines in the presence of n snif scrihing witness.

VLLM P.' HA-XMMGND. THEQDORE A. HMMOJD.

Winess:

,ARTHUR CHQQUM'.

passage 

